Drilling machine



News, 19 v 1,560,193

W; G. ALLEN DRILLING mcama Filed Aug. 19. 1922 s sheets-shun 1 47 z 42 f M Nov. 3, 1925- w.- e. ALLEN DRILLING magma glfil ed- M15. 1 9. 1922 3 Sheds-Sheet 2 lLll inf/770R Array/95 Nov. 3', 1925- 1,560,193

W. G. ALLEN munmue moans F11 6 Aug. 19. 1922 3 Sheets-Sheet :s

G 70 T l C4 hrs/Wm a aeenny small Patented Nov. 3, 1925.

"untrue STA-res wILnIAMe. ALL N, or west HMtrronn, WRIGHT MANUFACTURING COMPANY,

"anon or CONNECTICUT.

connnor'rour, nssrenon. ro rnnniannr & or HARTFORD, CGNNEGIICUT, A 'oonrona- DRIILiLING"-MACHINE.

Application filed August 19, 1922. "Serial No. 582594.

To all whom it may concern;

Be it known that 1, WILLIAM G. ALLEN, citizenof the United States, residing'at West Hartford, in'the county of Hartford and State of Connecticut, have invented a new and useful Improvement in Drilling cMaohines, of which the following is a specification. V

, This invention relates to the means employed for feeding and rotating the tool spindles of drill presses. It is common practice to provide the vertical drill spindle of such machines with a cone pulley jand provide the horizontal driving shat't witha cone pulley. The driving belt that passes around these pulleys runs over intermediate *idler pulleys and is shifted from one step to anotlier of the cone pulleys to obtain the desired spindle speed, the idler pulleys being adusted to sperm'itthis and keep the 'belt tig 1t. Drills of 'diilerent sizes are used in these presses and the resistance offered by the work or thepower required to drive the spindle'de ends on the size of the drill and the material being drilled. Different sizes of 'drills are driven at different speeds and the harder the work required of a drill the greater must be the tension on the belt to insure suflicient traction. In prior machines it has been customary to adjust the idler pulleys so that at the difierent speeds the 'tension of the belt will be sufiicient to drive the largest-size of drill to be used at the :particular speed employed. As a result of this when small drills are used at that speed "the belt strain is too great, there is unnecessary side pull on the spindle bearings-and the drills frequently break, particularly if fed too fast, causing undue friction, loss of time, ruin of the drill and possible injury to the work.

As the diameters of the steps of the cone pulley on the tool spindle are different and the distances of the idler pulleys therefrom vary according to the pulley step being used, the belt-always being thesaine i leng-th, the angular (relations of the idler piilleys to the cone pulleyv should ehan'ge with the difrevert adjustments of the tenet the-'co'ne pulley order to-have'lthe belt -run mo st efliecti'v'ely and without edge reictien. Furthermore "whenidrills am; used at high' spe'eds,

j j s it is neeessary to -have the been ig's thorougt-rly sabercated and the spindle feeding means very sensitive in order that the drills may be. under absolute control, and also to have the feed capable of beingstcpped at any e not point without strain being transmitted to thedrill spindle I The object otthe present invention is to .provide neans whemby the tension or tractive .power of the driving belt is regulated at the several speeds according to the capacity of the drill; to provide a simple and quickly operated means "for changing the position of the cone pulley on the tool spindle for obtaining the different speeds; to provide means whereby the icller ,pu-lleys automatically align themselves with the steps of the cone pulley on the tool spindle when adjusted to their several :positions; to provide means which can be set to stop the feed of the spindle at any requir ed point, without putting strain 'on the spindle, and which will return the spindle if desired; and to ensure the proper lubrication of the spindle bearings. v

In the accompanyingdrawings Figure 1 shows aside elevation of the upper part of a drill press provided with driving means which embodies this invention. shows a top view of the driving means. Fig. 3 shows a vertical section of the spindle pulley with its connections and support. Fig. et is a horizontalsection on the plane indicated by the dotted line 4-4 on Fig. 3. t Fig. 5 shows a plan {of the lubricating nut used in connection with the spindle Pulley bearlngs. Fig; 6 1s an edge v1ew 02E thls nut. 'Flg. 7 1s a side new on larger scale 0t aportionot' the driving belt tensioning'means.

Fig. 8 top view of the belt tensioning means. Fig. 9 is a-tragmentary side view showing means which may be employed for giving the driving belt an extra amount of tension, Fig. 10 is a topview of the nea ns shown inFig. 9. Fig. -1;1;is a top view of the d1"iving means showing ccnneetions where y the idler pulleys automatically align themselves with the spindle cone .pullay-as theyiare movedin and out for ad- Fig. 2

justment- Fig. 12- shows end view of what is shown in -Fig. 1-1, Fig, 13 "shows on larger scale a,,;frontfvi ew of the spindle feeding "means. "Fig". 14 -shows ajsi-de view 1 f the spindle feeding-mea s; Fig--15 is. vertio aeliseetiondn LIi-l'ttll denoted by dotted line 1515 on Fig. 13. Fig. 16 is a horizontal section on plane denoted by dotted line 1616 on Fig. 13.

In the form of press illustrated the driving shaft 1 is mounted on a bracket 2 fastened to the lower end of the column 3. On the driving shaft is a cone pulley 4. The tool spindle 5 provided at its lower end with a common type of chuck 6 is supported near its lower end by the adjustable bracket 7 and near its upper end by the forked bracket 8. The spindle extends vertically through a sleeve 9 and it is splined thereto by pins 10 so that the spindle may have an up and down movement through the sleeve but will be rotated thereby. On the sleeve is a conepulley 11. This pulley is mounted so that it may be moved up and down on the sleeve but it is connected therewith so as to rotate the sleeve, by a feather 12. A washer 13 is fastened to the pulley by screws 14 that extend through slots 15 in the washer into the pulley. By reason of the slots the washer may have a slight ro tatory movement with relation to the pulley. In the washer is anotch 16 and in the feather are notches 17. \Vhen the washer is turned with relation to the pulley so that the notch 16 coincides with the feather the pulley is free to be moved up and down on the sleeve.

After the pulley is moved to the required elevation the washer is turned so that it enters one of the notches in the feather and holds the pulley at that elevation. At the upper end the sleeve upon which the spindle pulley is mounted is supported by antifriction bearings 18 and at the lower end the sleeve is supported by anti friction bearings 19. The inner race 20 of the lower bearing is held up in position by a nut 21 that is screwed on the lower end of the sleeve. This nut has a flange 22 with sections 23 cut away and the edges of the cut sections beveled off as at 24. When the sleeve is rotated by the pulley for driving the tool spindle'the inclined portions of the flange of the nut which holds the inner race of the bearing, throws lubricant which is contained in the cap 25 up into the bearing. The cap is arranged to hold the outer race 26'of the bearing in position and it is provided with a tube 27 that fits quite closely to the spindle so as to prevent lubricant contained in the cap from leaking out around the spindle. The flange 28 of the bushing 29 on the upper end of the sleeve may be cut in the same manner for the same purpose.

The belt 30 passes'around the driving pulley and around the spindle pulley running'over the idler pulleys 31 located between the driving and spindle pulleys; The idler pulleys are carried by swivelled forks 32 which are mounted on a slide 33 that is movable back and forth ina way -in the extension at the back of the top of the column. This slide which carries the idler pulleys has an arm 34 that extends toward the front of the press. In the upper edge of this arm are rack teeth 35. Connected to the front end of the arm is a chain 36 that passes over a pulley 37 and at its lower end has a weight 38. The function of this weight of fixed capacity is to pull the slide back with only suflicient force for the idler pulleys to take up the slack in the belt, it is not intended to cause the pulleys to give full tractive tension to the belt. Engaging the rack teeth in the arm which extends forwardly from the idler pulley slide is a pinion on an arbor 40 that is mounted at the top of the column. Fastened on the arbor outside of the frame is a ratchet wheel 41 and outside of the ratchet wheel and loose on the arbor is a lever 42. Pivoted on this lever is a pawl 43 which has a tooth that engages the teeth of the ratchet wheel fixed on the arbor. Movable on the lever that is loose on the arbor is a weight 44. This weight bears down the outer end of the lever and through the pawl and ratchet wheel tends to turn the arbor in such manner that the pinion engaging with the rack teeth forces the slide back and causes the idler pulleys to tension the driving belt. Through this mechanism the tension of the belt depends on the location of the weight along the lever. The weight is adjusted along the lever according to the size of the drill to be used, the lever being preferably notched and provided with indications which will show the proper positions of the weight for various sizes of drills. If a small drill is being used the weight is pushed back on the lever so the tractive power of the belt will be relatively light. If a large drill is being used and the tractive force of the belt must be heavy, the weight is drawn toward the front of the lever. Thus by slipping the weight forward and back on the lever the tension of the belt may be adjusted according to the capacity of the drill. The upper end 45 of the pawl is wedge-shaped and is adapted when the lever is lifted to engage a pin 46 that projects from the frame. When this end of the pawl engages the pin the toothed end of the pawl is disengaged from the ratchet leaving the belt tensioned only by the pull of the fixed weight.

For the purpose of aligning the idler pulleys with the steps of the spindle cone pulley, plates 49 with obliquely formed grooves 50 are fastened at the sides ofthe slide 33 in the extension at the back of the top of the column.

lugs 52 -projecting from the forks 33 that are pivotally mounted on the slide and that carry thexidler pulleys; Eigs 11 and. 12.

In these grooves are guideblocks 51 which are swivelled to that is to be used.

which will give the required speed. the washer is turned to hold the pulley in weight oh'the lever is moved :o

1,56bjiee By these means when the slide is moved inward and the distance between the idler pulleys and the cone pulley decreases, as when the belt is to be used on a step of greater diameter, the idler pulleys are swung out so that their centers will line with the traction surfaces of the step of the 'cone pulley that is to be used. hen

the slide is moved outward and the distance between the idler pulleys and the cone pulley is increased, as when. the belt is to be used on a smaller step, the idler pulleys are swung in so that their centers will line with'the traction surfaces of the cone pulley As a result of thi'sthe belt'traeks over the idler pulleys and about the cone pulley so that it is unnecessary to provide belt guides which tend to cause "frietio'n and wear the edges of a belt.

To shift the belt the weighted lever is lifted and'the slide'drawn forward by pulling on the belt. The washer is turned and the spindle pulle is raised or lowered so that the belt will pass around the step Then the purpose of giving 'the driving belt an extra amount of tension a segment {47 with ratchet teeth may be fastened to' thebracket 8. The lever may be eI-itended to the frontof the inarhine past thesegment and provided with a. springcontrolled pawl 48 located so that it may be turned into or'out of engagement with "the teeth on the rack as shown in Figs. 9 and 10. hen the tension of the beltis to be determined by the position of the weight a l on the lever the pawl a8 is turned away from the ratchet teeth. If it is desired to give the driving belt more tension this pawl is turned into engagement with the ratchet teeth and the handle end of the lever in front is drawn down. By this means any required tension may be given to the belt and the belt retained at that tension.

The tool spindle 5 near, its lower end pass as through the sleeve 52-3 which is supported by the bracket 7 in the usual way so that while the tool spindle is free to rotate, it carried up and down for feeding and returning the drill'by the vertical movements of the sleeve. On the back of the sleeve is the usual rack and engaging with this rack is a pinion 55 formed on an arbor 56 that is supported by the bracket. Fixed on one end of the arbor is a knurled hand wheel 58 through the hub of which exteiids the usual handle rod 59.

Turning the spindle by means of the rod or the hand wheehthrough *the pinion and rack raises or lowers the tool-spindle carrying sleeve. Loosely inountetlon the arbor between the bracketand thehu'b of the hand wheel is a collar 60 in one face of which near 'theedge is a notch "61, one wall 62 of which noteh is parallel with the axis of the arbor and the other wall 63 is oblique.

In a socket in the bracket and extending parallel with the axis of the arborfis a 'latch pin 64- 'that is normally pressed out by a s'pring 65 into the notch 'inthe collar. The latch has an outwardly extending pin "66 by means'of which it can be drawn back 'the pressure of the spring. Threaded through the collar and adapted to be turned against the arbor "is a screw 67 and threaded through the collar and adapted to be turned into the notch is a screw (i8 provided with a clamp fruit 69. lVhen the screw 67 1s loosened the collar may be rotated'onthe arbor "so to position the notch in the face of the collar in k the desired relation to the stop latch.

\Vhen the eollaris 'fixedpn thearbor by the screw '67 and the handle is turned back for lifting. the tool spindle the latdh pushed back out of the notch by the inclin'ed wall '63 so "that the drill carried by"- the tool spindle an'ay raised to the de- "sired height. \Vhen the handle is turned forward the tool spindle is lowered and carries the'drill down until the 'noteh'eomes 'epposite the latch, then the latch is pushed into the path of the end of the sere'w 6S and further downward movemeii't of the spindlje and drill prevented. For stopping the drill at the proper point the screw (57 loosened and the collar turned to give the approximate result, and thescrew 67 is tightened so as to clamp the collar to the arbor. After the collar has been thus roughly adjusted the screw 68 is turned in or out to give the exact adjustment and the clamp nut 69 is set. The point of the drill when moved. down is arrested in exact position by the engagement of the end of the screw 68 with the stop latch 6a. This stop is positive and should the operative continue to pull on the handle the strain is resisted by the screw and latch and is not transmitted through the pinion to the sleeve which carries the tool spindle.

On the end of the arbor opposite the handle is a collar 70. This collar is surrounded bracket and is thrust outward by a spring 77. This latch has a pin 78 by means of which it may be withdrawn from the teeth on the back of the casing. The spring is arranged so that it is wound up as the handle is turned for feeding the drill downward and when the handle is released the spring rotates the arbor and pinion and through the rack and sleeve lifts the drill spindle and drill. The tension of this spring may be increased or diminished or in fa t entirely released by pushing back the latch 7 6 by means of the pin 78 and then turning the casing in the necessary direction to give the required result. If it is desired to release the tension of the spring entirely and hold it'released, the pin 78 is pushed and then turned over into the slot 79, Fig. 13, so as to hold the latch retracted.

By this means the rapid running spindle may be raised and lowered and stopped at the exact predetermined positions without danger of applying any distorting strains to the drill spindle and thus great sensitiveness is attained.

The invention claimed is:

1. A driving mechanism for drill presses comprising a driving pulley, a spindle pulley, idler pulleys, a belt passing around the driving and spindle pulleys and over the idler pulleys, a slide carrying the idler pul leys, a rack connected with the slide, a pinion meshing with the rack, a lever for rotating the pinion, a weight adjustable on the lever, and means for drawing down and holding the lever independent of the weight.

2. A driving mechanism for drill presses comprising a driving pulley, a spindle pulley, idler pulleys, a belt passing around the driving and spindle pulley and over the idler pulleys, said idler pulleys being adjustable for tensioning the belt, a weight adjustably conne'ted with the idler pulleys whereby the tension of the belt may be determined by the position of the weight, and means for giving more tension to the belt than that imparted by the weight.

3. In combination with a drill press frame, a driving mechanism comprising a driving pulley, a spindle pulley, a slide movable on the frame toward and from the spindle pulley, a weight adapted to draw the slide away from the spindle pulley, idler pulleys swivelled upon said slide, a belt passing around the driving and spindle pulleys and over the idler pulleys, a rack attached to the slide, a shaft rotatably mounted on the frame, a pinion fixed on the shaft and meshing with the rack, a ratchet wheel fixed on the shaft, a lever loose on the shaft, a weight adjustable on the lever toward and from the shaft, and a pawl carried by the lever and engaging said ratchet wheel in such relation that the lever under the influence of the weight tends to draw the slide away from the spindle pulley.

4:. A driving mechanism for drill presses comprising a driving pulley, a spindle pulley, idler pulleys, a belt passing around the driving and spindle pulleys and over the idler pulleys, stationary ways, a slide reciprocable on said ways toward and from the spindle pulley, means for moving the slide, swivelled supports mounted on the slide and carrying said idler pulleys, aguide fixed on the slide-way at each side of the slide and extending obliquely with relation to the path of movement of the slide, and means connecting each swivelled idler pulley support with one of said guides, whereby the angular relations of said idler pulleys to the slide and spindle pulley is altered by the reciprocating movements of the slide.

"WILLIAM G. ALLEN. 

